<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <div class="container">
      <span>this is a book</span>
    </div>

    <style>
      * {
        margin: 0;
        padding: 0;
      }
      .container {
        background: #000;
        text-align: center;
        filter: contrast(12);
        span {
          width: 100%;
          font-size: 50px;
          color: #fff;
          animation: change 2s linear infinite alternate;
          filter: blur(3px);
        }
      }

      @keyframes change {
        from {
          letter-spacing: -50px;
        }

        to {
          letter-spacing: 10px;
        }
      }
    </style>
  </body>
</html>
